netdev - Re: [PATCH v1] hamradio: remove needs_free

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Date:   Sat, 13 Nov 2021 04:20:09 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Lin Ma <linma@....edu.cn>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        jirislaby@...nel.org, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] hamradio: remove needs_free_netdev to avoid UAF

Hello:

This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@...nel.org>:

On Thu, 11 Nov 2021 22:14:02 +0800 you wrote:
> The former patch "defer 6pack kfree after unregister_netdev" reorders
> the kfree of two buffer after the unregister_netdev to prevent the race
> condition. It also adds free_netdev() function in sixpack_close(), which
> is a direct copy from the similar code in mkiss_close().
> 
> However, in sixpack driver, the flag needs_free_netdev is set to true in
> sp_setup(), hence the unregister_netdev() will free the netdev
> automatically. Therefore, as the sp is netdev_priv, use-after-free
> occurs.
> 
> [...]

Here is the summary with links:
  - [v1] hamradio: remove needs_free_netdev to avoid UAF
    https://git.kernel.org/netdev/net/c/81b1d548d00b

You are awesome, thank you!
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